I'm a big fan of services such as Rifftrax, and I hate having to manually mux files every time I purchase another release. Much in the same way that external subtitle file support was added, it would be nice to have external audio track support for TV and movies added as well. I wouldn't expect Emby to handle the offset calculations needed to sync the audio. It's not too difficult for me to modify that now.
There are features where you know all about it - how it can work, how it needs to be implemented and where you are sure that it will work out successfully.
Other features require a certain amount of research to evaluate and determine whether it's doable, which effort it would take and whether the results would be reasonably useful.
Another category of features exists, where you know up-front that there's nothing to win, which means that you know that you can't deliver it in a way that